*{
	margin: 0；
	padding: 0;
}
body{
	text-align: center;
}
img{
	width: 300px;
	margin-top: 100px;
}
.bottom_nav div:nth-child(2){
	background: url(../images/change1.png) no-repeat center 8px;
}
.bottom_nav div:nth-child(3){
	background: url(../images/profile.png) no-repeat center 8px;
}
.bottom_nav div:nth-child(1){
	background: url(../images/home.png) no-repeat center 8px;
}